2WHB

Truncation and Optimisation of Peptide Inhibitors of CDK2, Cyclin A Through Structure Guided Design


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Truncation and Optimisation of Peptide Inhibitors of Cyclin-Dependent Kinase 2-Cyclin a Through Structure-Guided Design.

Kontopidis, G.Andrews, M.J.Mcinnes, C.Plater, A.Innes, L.Renachowski, S.Cowan, A.Fischer, P.M.

(2009) Chemmedchem 4: 1120

  • DOI: 10.1002/cmdc.200900093
  • Primary Citation of Related Structures:  
  • Also Cited By: 2X1N

  • PubMed Abstract: 
  • Peptides that inhibit cyclin-dependent kinase 2 by blocking the macromolecular substrate recruitment site of cyclin A were simplified, for example, by replacement of dipeptide units with beta-amino acids. The smallest inhibitor retaining activity was ...

    Peptides that inhibit cyclin-dependent kinase 2 by blocking the macromolecular substrate recruitment site of cyclin A were simplified, for example, by replacement of dipeptide units with beta-amino acids. The smallest inhibitor retaining activity was a tripeptide, whose binding mode was confirmed by X-ray crystallography. This result suggests that nonpeptidic cyclin groove inhibitors may be feasible therapeutic agents.The cyclin-dependent kinase 2-cyclin A complex is an important regulator of the DNA-synthesis phase of the mammalian cell cycle, which is frequently deregulated in cancer. Rather than blocking the ATP-binding site of the apparently redundant kinase subunit, targeting the binding site for macromolecular substrates and regulatory proteins of cyclin A represents a promising strategy to enforce tumour-selective apoptosis. The cyclin-binding groove can be blocked with comparatively small synthetic peptides, which indirectly leads to inhibition of kinase function, but these peptides are metabolically labile and membrane impermeable. As part of our ongoing effort to develop more druglike peptidomimetics derived from cyclin-groove-binding peptides, we report the results of our studies aimed at a detailed understanding of the structural determinants required for effective binding. Using a combination of peptide synthesis, biochemical assays and X-ray crystallography, we show that it is possible to simplify peptide structures through the replacement of dipeptide units in which one of the residues is not directly involved in binding, through the introduction of beta-amino acid residues that retain only the dipeptide residue side chain that is important for binding. This approach also allowed us to probe spatial constraints in general, as well as the importance of peptide backbone hydrogen-bonding functions. Our identification of potent beta-homoleucine-containing tetrapeptide inhibitors, as well as the finding that an optimised N-terminally acetylated tripeptide retains some cyclin A-binding affinity, suggest that the pharmacological targeting of the cyclin A binding groove may be feasible.


    Organizational Affiliation

    Veterinary School, University of Thessaly, Karditsa 43100, Greece.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CELL DIVISION PROTEIN KINASE 2
A, C
298Homo sapiensMutation(s): 0 
Gene Names: CDK2 (CDKN2)
EC: 2.7.11.22
Find proteins for P24941 (Homo sapiens)
Go to Gene View: CDK2
Go to UniProtKB:  P24941
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYCLIN-A2
B, D
260Homo sapiensMutation(s): 0 
Gene Names: CCNA2 (CCN1, CCNA)
Find proteins for P20248 (Homo sapiens)
Go to Gene View: CCNA2
Go to UniProtKB:  P20248
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
ARG-ARG-L3O-PFF
E, F
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
E, F
NON-POLYMERH2 N

--

PFF
Query on PFF
E, F
L-PEPTIDE LINKINGC9 H10 F N O2PHE
L3O
Query on L3O
E, F
L-peptide linkingC7 H15 N O3LEU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 74.423α = 90.00
b = 114.924β = 90.00
c = 154.468γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MOSFLMdata reduction
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-08-24
    Type: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Version format compliance
  • Version 1.2: 2017-02-08
    Type: Source and taxonomy